| /* |
| * Copyright (C) 2020 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.systemui.navigationbar.buttons; |
| |
| import android.content.Context; |
| import android.content.res.Configuration; |
| import android.content.res.TypedArray; |
| import android.graphics.Rect; |
| import android.util.AttributeSet; |
| import android.view.MotionEvent; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.FrameLayout; |
| |
| import androidx.annotation.VisibleForTesting; |
| |
| import com.android.systemui.R; |
| |
| import java.util.ArrayList; |
| import java.util.Comparator; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * Redirects touches that aren't handled by any child view to the nearest |
| * clickable child. Only takes effect on <sw600dp. |
| */ |
| public class NearestTouchFrame extends FrameLayout { |
| |
| private final List<View> mClickableChildren = new ArrayList<>(); |
| private final List<View> mAttachedChildren = new ArrayList<>(); |
| private final boolean mIsActive; |
| private final int[] mTmpInt = new int[2]; |
| private final int[] mOffset = new int[2]; |
| private boolean mIsVertical; |
| private View mTouchingChild; |
| private final Map<View, Rect> mTouchableRegions = new HashMap<>(); |
| /** |
| * Used to sort all child views either by their left position or their top position, |
| * depending on if this layout is used horizontally or vertically, respectively |
| */ |
| private final Comparator<View> mChildRegionComparator = |
| (view1, view2) -> { |
| int leftTopIndex = 0; |
| if (mIsVertical) { |
| // Compare view bound's "top" values |
| leftTopIndex = 1; |
| } |
| view1.getLocationInWindow(mTmpInt); |
| int startingCoordView1 = mTmpInt[leftTopIndex] - mOffset[leftTopIndex]; |
| view2.getLocationInWindow(mTmpInt); |
| int startingCoordView2 = mTmpInt[leftTopIndex] - mOffset[leftTopIndex]; |
| |
| return startingCoordView1 - startingCoordView2; |
| }; |
| |
| public NearestTouchFrame(Context context, AttributeSet attrs) { |
| this(context, attrs, context.getResources().getConfiguration()); |
| } |
| |
| @VisibleForTesting |
| NearestTouchFrame(Context context, AttributeSet attrs, Configuration c) { |
| super(context, attrs); |
| mIsActive = c.smallestScreenWidthDp < 600; |
| int[] attrsArray = new int[] {R.attr.isVertical}; |
| TypedArray ta = context.obtainStyledAttributes(attrs, attrsArray); |
| mIsVertical = ta.getBoolean(0, false); |
| ta.recycle(); |
| } |
| |
| @Override |
| protected void onLayout(boolean changed, int left, int top, int right, int bottom) { |
| super.onLayout(changed, left, top, right, bottom); |
| mClickableChildren.clear(); |
| mAttachedChildren.clear(); |
| mTouchableRegions.clear(); |
| addClickableChildren(this); |
| getLocationInWindow(mOffset); |
| cacheClosestChildLocations(); |
| } |
| |
| /** |
| * Populates {@link #mTouchableRegions} with the regions where each clickable child is the |
| * closest for a given point on this layout. |
| */ |
| private void cacheClosestChildLocations() { |
| if (getWidth() == 0 || getHeight() == 0) { |
| return; |
| } |
| |
| // Sort by either top or left depending on mIsVertical, then take out all children |
| // that are not attached to window |
| mClickableChildren.sort(mChildRegionComparator); |
| mClickableChildren.stream() |
| .filter(View::isAttachedToWindow) |
| .forEachOrdered(mAttachedChildren::add); |
| |
| // Cache bounds of children |
| // Mark coordinates where the actual child layout resides in this frame's window |
| for (int i = 0; i < mAttachedChildren.size(); i++) { |
| View child = mAttachedChildren.get(i); |
| if (!child.isAttachedToWindow()) { |
| continue; |
| } |
| Rect childRegion = getChildsBounds(child); |
| |
| // We compute closest child from this child to the previous one |
| if (i == 0) { |
| // First child, nothing to the left/top of it |
| if (mIsVertical) { |
| childRegion.top = 0; |
| } else { |
| childRegion.left = 0; |
| } |
| mTouchableRegions.put(child, childRegion); |
| continue; |
| } |
| |
| View previousChild = mAttachedChildren.get(i - 1); |
| Rect previousChildBounds = mTouchableRegions.get(previousChild); |
| int midPoint; |
| if (mIsVertical) { |
| int distance = childRegion.top - previousChildBounds.bottom; |
| midPoint = distance / 2; |
| childRegion.top -= midPoint; |
| previousChildBounds.bottom += midPoint - ((distance % 2) == 0 ? 1 : 0); |
| } else { |
| int distance = childRegion.left - previousChildBounds.right; |
| midPoint = distance / 2; |
| childRegion.left -= midPoint; |
| previousChildBounds.right += midPoint - ((distance % 2) == 0 ? 1 : 0); |
| } |
| |
| if (i == mClickableChildren.size() - 1) { |
| // Last child, nothing to right/bottom of it |
| if (mIsVertical) { |
| childRegion.bottom = getHeight(); |
| } else { |
| childRegion.right = getWidth(); |
| } |
| } |
| |
| mTouchableRegions.put(child, childRegion); |
| } |
| } |
| |
| @VisibleForTesting |
| void setIsVertical(boolean isVertical) { |
| mIsVertical = isVertical; |
| } |
| |
| private Rect getChildsBounds(View child) { |
| child.getLocationInWindow(mTmpInt); |
| int left = mTmpInt[0] - mOffset[0]; |
| int top = mTmpInt[1] - mOffset[1]; |
| int right = left + child.getWidth(); |
| int bottom = top + child.getHeight(); |
| return new Rect(left, top, right, bottom); |
| } |
| |
| private void addClickableChildren(ViewGroup group) { |
| final int N = group.getChildCount(); |
| for (int i = 0; i < N; i++) { |
| View child = group.getChildAt(i); |
| if (child.isClickable()) { |
| mClickableChildren.add(child); |
| } else if (child instanceof ViewGroup) { |
| addClickableChildren((ViewGroup) child); |
| } |
| } |
| } |
| |
| /** |
| * @return A Map where the key is the view object of the button and the value |
| * is the Rect where that button will receive a touch event if pressed. This Rect will |
| * usually be larger than the layout bounds for the button. |
| * The Rect is in screen coordinates. |
| */ |
| public Map<View, Rect> getFullTouchableChildRegions() { |
| Map<View, Rect> fullTouchRegions = new HashMap<>(mTouchableRegions.size()); |
| getLocationOnScreen(mTmpInt); |
| for (Map.Entry<View, Rect> entry : mTouchableRegions.entrySet()) { |
| View child = entry.getKey(); |
| Rect screenRegion = new Rect(entry.getValue()); |
| screenRegion.offset(mTmpInt[0], mTmpInt[1]); |
| fullTouchRegions.put(child, screenRegion); |
| } |
| return fullTouchRegions; |
| } |
| |
| @Override |
| public boolean onTouchEvent(MotionEvent event) { |
| if (mIsActive) { |
| int x = (int) event.getX(); |
| int y = (int) event.getY(); |
| if (event.getAction() == MotionEvent.ACTION_DOWN) { |
| mTouchingChild = mClickableChildren |
| .stream() |
| .filter(View::isAttachedToWindow) |
| .filter(view -> mTouchableRegions.get(view).contains(x, y)) |
| .findFirst() |
| .orElse(null); |
| |
| } |
| if (mTouchingChild != null) { |
| event.offsetLocation(mTouchingChild.getWidth() / 2 - x, |
| mTouchingChild.getHeight() / 2 - y); |
| return mTouchingChild.getVisibility() == VISIBLE |
| && mTouchingChild.dispatchTouchEvent(event); |
| } |
| } |
| return super.onTouchEvent(event); |
| } |
| } |